clk: at91: clk-generated: Limit the requested rate to our range

[ Upstream commit af7651e67b9d5f7e63ea23b118e3672ac662244a ]

On clk_generated_determine_rate(), the requested rate could be outside
of clk's range. Limit the rate to the clock's range to not return an
error.

Fixes: df70aeef6083 ("clk: at91: add generated clock driver")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Link: https://lore.kernel.org/r/20210707131213.3283509-1-codrin.ciubotariu@microchip.com
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/clk/at91/clk-generated.c b/drivers/clk/at91/clk-generated.c
index b4fc8d71daf20fefeec201ac380984b99afa2d44..b656d25a97678335124babe97eb05b802fdad8cb 100644 (file)
--- a/drivers/clk/at91/clk-generated.c
+++ b/drivers/clk/at91/clk-generated.c
@@ -128,6 +128,12 @@ static int clk_generated_determine_rate(struct clk_hw *hw,
        int i;
        u32 div;
 
+       /* do not look for a rate that is outside of our range */
+       if (gck->range.max && req->rate > gck->range.max)
+               req->rate = gck->range.max;
+       if (gck->range.min && req->rate < gck->range.min)
+               req->rate = gck->range.min;
+
        for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
                if (gck->chg_pid == i)
                        continue;